Question

Where is dewatering required. Explain its types along with its context and types of dewatering?

Answer 1

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The process of removing underground water from the site where construction or excavation (for footing or mining) need to be done, is known as dewatering. This become very important to lower the level of water table under the ground before excavation because it may loosen the sand present in it and which decreases the strength of soil. Soil having weak strength below footing will not be able to bear the load of building and hence collapse. To reduce the effect of water seepage, dewatering is essential which can be achieve by evaporation and pumping out water from the water table.

Type of dewatering are:

Well points- This method of dewatering is acheive by installing wellpoint around the excavation site and water is pump out by some connectors like headerpipe which is connected with wellpoints.

Sump piping- This process is applicable for the shallow depth excavation. This process allow water to seep into excavation area and pumped out by the solid handling pump.

Deep wells- This process is great for the deep excavation. In this method a broad well is install outside the excavation site andpumpe out thorugh various methods of pumping.

Eductorwell- Water seep through the pores as the pore water pressure is responsible for that. To decrese the pore water pressure of the soil this mehtod is taken into account. The eductor allow high pressure water to run through it and this results in creating a vaccum which is good for the drainage purpose and reduce the level of water table.